205106811 has 16 divisors (see below), whose sum is σ = 336585984. Its totient is φ = 108188064.

The previous prime is 205106779. The next prime is 205106813. The reversal of 205106811 is 118601502.

It is not a de Polignac number, because 205106811 - 2⁵ = 205106779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205106813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375381 + ... + 375926.

It is an arithmetic number, because the mean of its divisors is an integer number (21036624).

Almost surely, 2^205106811 is an apocalyptic number.

205106811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205106811 is a deficient number, since it is larger than the sum of its proper divisors (131479173).

205106811 is a wasteful number, since it uses less digits than its factorization.

205106811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751330.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 205106811 is about 14321.5505794589. The cubic root of 205106811 is about 589.7392422362.

The spelling of 205106811 in words is "two hundred five million, one hundred six thousand, eight hundred eleven".